I was supposed to go back 6months later but I never did and now a part of my upper tooth (2nd molar maybe) has just fell out. I assume I ate something and it cracked and just started falling out thereafter. And one of the teeth below it (1st molar maybe) had a cavity and was filled but I assume the filling was temporary but this tooth has started to hurt a lot and I don't know why. The filling looks to be intact but it hurts a lot especially when I drink something cold. I'm going to go to the dentist soon but I just wonder whats going on with those two teeth.